Lee de Forest

Born: 1873
Birthplace: Council Bluffs, Iowa

Audion amplifier—De Forest inserted a third electrode between the cathode and anode to make his audion tube. Radio signals are picked up by connecting an antenna to the tube's grid. (1977)

Died: 1961
John DeereThe National Inventors Hall of FameRobert Heath Dennard


Play Hangman

Play Poptropica

Play Same Game

Try Our Math Flashcards